Y Combinator (YC) is the world's most prominent startup accelerator, founded in 2005 by Paul Graham, Jessica Livingston, Trevor Blackwell, and Robert Tappan Morris. Headquartered in San Francisco, California, YC pioneered the modern batch-model accelerator: twice a year it admits cohorts of early-stage startups, provides seed funding, and puts founders through an intensive three-month program culminating in Demo Day. Since inception YC has backed over 4,000 companies across more than 50 countries, with a combined portfolio valuation reported above $600 billion.
YC's standard deal offers $500,000 for 7% equity (terms updated in 2023 from earlier $125k/7% arrangements). The program covers product development, fundraising preparation, and access to an alumni network that functions as a durable competitive advantage for portfolio companies. YC does not publicly disclose assets under management in the traditional sense; follow-on capital is deployed through the YC Continuity Fund, a growth-stage vehicle that participates in later rounds of top-performing graduates.
Notable investments
- Coinbase (W2012) – YC's defining crypto win. Coinbase went public on Nasdaq in April 2021 at a valuation above $85 billion, delivering one of the highest returns in accelerator history.
- Stripe (S2010) – global payments infrastructure, valued at approximately $65 billion as of 2024, and one of the most cited examples of YC's payments thesis.
- Airbnb (W2009) – public since 2020; market cap above $70 billion at peak.
- DoorDash (S2013) – public since 2020; dominant U.S. food delivery platform.
- Reddit (S2005) – one of the earliest YC investments; IPO completed March 2024.
- OpenAI – YC backed the non-profit predecessor; now the most-discussed AI company globally.
- Brex (W2017) – corporate cards and fintech infrastructure targeting startups.
- QFEX (2026) – most recent disclosed deal in the payments vertical ($9.5M, March 2026).
Team
Founder Paul Graham stepped back from day-to-day operations in 2014. Garry Tan – previously a YC partner and co-founder of Initialized Capital – became President and CEO in January 2023. Tan has publicly refocused YC on AI-native startups and defense technology, and has been an outspoken voice in San Francisco civic debates. Long-serving group partners include Michael Seibel (CEO of YC from 2019 to 2022, now group partner), Gustaf Alströmer, Dalton Caldwell, and Diana Hu, among others. The full partner list is published on ycombinator.com.
Recent activity
YC's Winter 2025 and Summer 2025 batches skewed heavily toward AI infrastructure, defense tech, and payments. The organization increased its acceptance of international founders, with India, Nigeria, and Southeast Asia each contributing growing cohorts. In the crypto and payments space, YC has continued to back early-stage teams building on-chain payment rails, stablecoin infrastructure, and exchange tooling – consistent with the payments focus area reflected in its metadata. The QFEX deal in March 2026 ($9.5 million) signals continued appetite for regulated crypto exchange infrastructure.
YC's geographic anchor remains the United States, though Demo Day attendance and remote participation have made it effectively global. The fund's failure rate is high by design – most cohort companies do not survive – but the distribution of outcomes is skewed dramatically by outliers. A single Coinbase or Stripe more than compensates for hundreds of failed bets. For early-stage crypto and payments founders, a YC acceptance remains one of the most credible signals available in the market. Further background is available via Crunchbase and YC's own official site.
